When he finally stopped looking at Hulk as a problem and instead as a solution, Bruce brought the best of both worlds together through gamma radiation, allowing him to finally achieve a sense of peace and the world to see Hulk as a proper superhero.
This makes for a cool ‘what could have been’ scenario (another if Hulk had been dusted), but within the actual MCU timeline, it took a little longer for Bruce Banner to finally achieve a balance with The Hulk.